Pocket lighter



I June 26, 1951 w. DALLENBACH 2,558,607

POCKET LIGHTER Filed Feb. 26, 1947 5 Sheets-Sheet 1' m1 Fig.2

a 2 2 3 7 22- 2o 7 7 I 37/35 3 III June 26, 1951 w. DALLENBACH POCKETLIGHTER 5 SheetsSheet 2 Filed Feb. 26, 1947 m E W Q UO A W. DALLEN BACHJune 26, 1951 POCKET LIGHTER 5 Sheets-Sheet 3 Filed Feb. 26, 1947 Fig. 7

[HMO/MOP W. DALLEN BACH June 26, 1951 POCKET LIGHTER Fil ed Feb. 26,1947 5 Sheets-Sheet 4 Fig. /0

Inventor ,%//JWW June 26, 1951 w. DALLENBACH v POCKET LIGHTER 5Sheets-Sheet 5 Filed Feb. 26, 1947 ll ll IIMKUH 4H 7 Inventor fi jmwPatented June 26, 1951 "UNITED. STATES PATENT POCKET LIGHTER *WaltcrDallenbach, Zurich, Switzerland Application February 26, 194?;Serial'No.731,018

' --InSwitzerland February 26, 1946 A Claims. 1

.Thepresent invention relates topocket lighters .ofthe type having.a'lighter body and a hinged -covenand in which ignitionsparks areproduced vby..a..llint -urged against. a friction wheel which is.operated by ;..a.-.finger actuated ,drivingroller.

.In pocket -:.lighters. having hinged covers, the

-facility-and commodity with-which the cover may be opened and closed in,use, is .of particular importance. In such lighters, .usually ,a.spring determines the open .and the. closed .position of the cover. aspositions .of. stable equilibrium. For convenient and. reliableoperation ,of the cover, it is necessary vthat .the pivoting movement.of. the

cover can be effected with .the least possible friction.

According. to the.,present .invention a blade spring-is inserted.betweenthebodyof. the lighter ,andthe ;cover,. said spring being. subjectedtoflexure and compression upon opening or closing of the cover.Thehladespping tensioned inappropriate manner between. cover .and bodyof the lighter ,..operates so -.that. the. cover, by a 2springtogglejoint action, .can vbe-tilted through .a. position of.unstableequilibrium fromclosedto. open position, and when .the .blade:springis disposed in appropriate manner, this pivoting movement end ofthe flint in the sleeve and .urges-itagainst the. friction wheel.

The accompanying drawings representby 'way ..of example-threeembodiments .of ,.the .present invention.

Fig. 1 shows a-,lighter according t .the first example in elevation.

Fig.2 is a'vertical section .along theline .IIII

.of-Figrfi, with the cover in open position.

Fig.3 is a verticalsection alongthe line IIIIII of .5 with the cover inclosedposition.

Fig. 4 isavertical section alongthe line. IVIV ofrFig. 5.

Fig. 515 a top plan-view of the, lighter-with the opened cover shown insection.

*Fig; 6 isa-viewfrombelow showing the bottom .ofthe lighter.

=-Fig.-7;is-aiview in elevation of a modified lighter. :Fig. 8 .isa.vertical section along the line V111.-

VIII of Fig. 11, with the cover shown in. open position.

Fig. 9 is a vertical section along the line IXIX of Fig. 11, showing thecover in closedposition.

Fig. 10 is a vertical section through the lighter along the line X-X ofFig. 11.

Fig. 11 is a top plan view of the lighter, showing the opened coverinsection.

Fig. 12 is a view of the bottom-of the lighter.

Fig. 13 shows a furthermodification of a lighter in elevation, partiallyin section along the line XIII-XIII of Fig. 1-4.

Fig. 14 is atop plan view of the lighter showing the openedcover-in'section.

Fig. 15 is a vertical section along the line XVXV of- Fig. 14.

Fig. 16 is a perspective view of the flint-sleeve.

Referring to Figs. 1 to 6, the represented pocket lighter comprises abodyl which'mayconsist of .light metal. The cover z, preferably also oflight metal, is hinged to the body I by means of the axis. 3. As can berecognized from Figures 2, 3

and-5, a blade spring'l-formed by a thin, rectangular piece of steelplate, is clamped by two opposed sides of the rectangle between twonotches 3E and 3?, one of which notches 36, as

'particularlyFigure 3 clearly shows, is disposed in the body I ofthe-pocket lighter and'the other, 3?, inthe coverZ. Both notches areparallel to the axis of rotation '3 oithe cover. When opening or closingthe cover Zthe distance between the two notches decreases first from aninitial value until a'minimum, and then increases again until a finalvalue. During the pivotal stroke of the cover 2, the'b-lade spring 2'clamped between the notches -36- andte'l with'an-appropriate initialtension, is first compressed and subjected to flexion, and then extendsagain.

Since the two opposed sidesof the blade spring '5 are mounted in thenotches like knife edges, practically any friction of the springmechanism is avoided, with -the most simple construction of theresiliency to be imagined. -As a rule the mutual position of the twonotches '36 and 3'5 will be chosen so that the minimum of their distanceis reached when approximately the coverZ is half open. The half openedcover 2 is at unstable equilibrium and has the tendency, when deviatingfrom this position of-unstable equilibrium to tilt resiliently eitherdownwardly or upwardly.

The spring 1, instead of being made of a plane piece of steel plate, mayconsist also of an undulated piece of steel plate, in which theundulations are parallel to the two notches 36 and .37, and accordinglyparallel to the axisof rotation 3 of the cover 2. The undulatedconstruction of the spring has the advantage that for approximativelythe same spring force, the steel plate can be made stronger, thus moresolid.

In order to be able to open the pocket lighter conveniently with thethumb of the right hand, the cover 2, as can be seen from Figures 1 and2, slightly projects beyond the vertical front face of the body I. Inorder to enable closing of the cover in similar convenient manner, theaxis of rotation 3 and the hinge between the cover 2, and the body 5 areso disposed, that in open position the cover 2 projects about for itsthickness beyond the vertical rear face of the body I, as can berecognized from Figure 2 and therefore the cover can be closedpreferably with the bend of the index of the right hand.

The correct operation of the cover, however, does not depend only on theexpedient formation of the spring mounting, also the disposition of theaxis of rotation is of great importance. It is to be recommended toprovide only two journals and to dispose them at a maximum distance,that is at opposite ends of the axis of rotation 3. In the representedexample, accordingly, as can be recognized particularly from Figure 5,the axis 3 is firmly pressed into the cover 2 and rotatably mounted withboth its ends in the body I of the pocket lighter.

A further feature of the invention resides in the disposition of theflint 25 in such manner that it can be directly seen in its longitudinalextension when the cover is opened. The flint 23 is lodged, as can berecognized from Figure i, in an upwardly open channel It} provided inthe upper side of the body 2. This disposition has two advantages.First, each time the cover is opened, the length of the flint pin can bejudged. The user is thus capable of timely exchanging a flint which isnearly used up. Second, the manufacture of the pocket lighter issimplified and cheapened, because the upwardly open channel, forexample, can be produced by hot pressing in a single operation togetherwith the formation of the remaining portion of the upper side of thebody I. The flint 2b is prevented from falling out of the channel l9 bythe friction wheel is which is formed with a shoulder 38 at its upperend under which the flint 20 is placed, pressed by the nose 2 2 of thepressure lever 2i. The pressure lever 2i is rotatably mounted on a pin24, as shown by Figures 3 and 4. The pin 24 is pressed into the body Iof the pocket lighter. The bearing as of the pressure lever M on the pin24 is surrounded by a coiled spring 23, which engages with one end asmall bore in the body of the pocket lighter, with the other end asimilar small bore in the pressure lever 12!. When mounting the pressurelever M an initial tension is imparted to this spring 23, so that thenose 22 of the pressure lever 2i forcibly presses the flint 20 againstthe friction wheel It at any length which the flint may have. Theupwardly projec ing portion-of the nose 22 on the pressure lever 2!enables to relieve the flint 25 from pressure and to remove it from thechannel is or to place a new flint in the latter.

The friction wheel 58 havin as shoulder 38 at its free end, is providedwith a bore having a left hand thread and thus forms a nut on the freeend of the axis H of the driving roller I6. When mounting the ignitionmechanism, first the driving roller 56 is placed into the recess 42provided in the body l and then the axis I! is pressed from above intothe driving roller 26, so as to= become fixed in this latter. After thisoperation the friction wheel I8 having a left hand thread can then bescrewed on the axis I1 and tightened with a pin spanner engaging intothe two holes 53 provided in the free end face of the friction wheel I8.

The fuel reservoir consists of the proper provision chamber 8conveniently filled with cotton, and of the wick chamber II. These twochambers are communicating by an opening I0. Such a division of the fuelreservoir has different advantages. The provision chamber 8 can be boredas a longitudinal hole by means of a milling cutter. In the same clampedposition of the blank from which the lighter bod is to be produced, thewick chamber I I, with the thread for the filling screw I4, is cut outfrom the body I by means of appropriate drills. Afterwards the openingI0 must be broken through by means of a milling cutter working at anangle. Now the provision chamber 8 can be filled with cotton and a plug9 destined to close the hole through which the drills were inserted, canbe pressed in the bottom so as not to be detachable. Then it is possibleto draw the wick l2 into the wick conduit l3 through the opening for thefilling screw I4, independently of the cotton filling in the provisionchamber 8. The upper end of the wick conduit I3 is formed by the wicktube I5 which slightly projects beyond the body 1 of the pocket lighter.

The described division of the fuel reservoir has further the advantagethat the filling screw I4 is screwed into the integral bottom of thebody I and not into the pressed plug 9.

Finally it appears that the small provision of petrol which is alwayspresent in the wick chamber II and not bound to the cotton filling,provides a longer burning flame upon ignition of the wick.

A special air conduit 25 leads from the upper face of the body I nearthe wick tube I5 (Figs. 3 and 5) to the recess 42, in which the drivingroll-er I6 is inserted. This air duct 25 is not visible from theexterior on the pocket lighter, but allows for a better feeding of airto the flame of the wick.

In order to prevent the evaporation of fuel when the cover is closed, ametal cap 4 is placed over the wick tube I 5. This cap 4 is movable in asleeve 6, but cannot move out of it so as not to be lost. The sleeve 6is pressed into the cover 2 and between the cover 2 and the bottom ofthe cap 4 there is a small sprin 5 which tends to press the cap 4downwardly. In this manner a tight closure of the wick tube is obtained,provided naturally that the air duct 25 discharges outside of the cap 4.

The lighter according to Figures 1 to 6 is characterized by a minimum ofscrew connections. Besides the filling screw I4 and the exchangeablefriction wheel I8 no screw connections at all are present in theconstruction.

The shape of the cover 2 and of the upper part of the body I allows toproduce these parts in simple manner by warm pressing or by die-casting.When warm pressing as well as when diecasting, only the holes for theaxis of rotation 3, the pin 24, the wick sleeve I5, the axis I1 and theair holes 25 are to be drilled as additional machining from the upperend of the body. All these borings, with the exception of the bore forthe axis of rotation 3 of the cover, are effected Vertically from top tobottom. From the lower end of the body I the provision chamber 8, theWick chamber II with the thread for the filling 'zaaseaeov screw I 4and;the .conduitslt. for." theiwicki I 2 must "be bored-s:Whenrproducingthe.body lrbyc'diecasting,-1ithe PI'OViSiOIIJJChambBI 8:and, the Wick .achamb.er.-ll can.:be..-left openalready when die-;casting. .The .twopnotchestfitand 3! formountj.. ing;the-;;springlarermade' in the most simple -manner :by.:striking'orrengraving: bymeans of a :..:chise1-.like,gnidedtool.

."A particular feature Whichgives a pleasant as- .epe'ct, to.the-;present construction, consists in that -th6TCOVeI'I2'1BSf/S'0I1 thebody Iin a planebeyond "which. no partsproject besides the nose;22 forop- .eratingthe pressure lever 2 I HA- further; advantage: of the.described ignition .mechanism comprising:the flint Zfl-placed in the..channel .I9'from above, .and pressed. against the :friction wheel I8by-the pressure lever 2|, con- .sistsin' thepossibilityeofl a compactdisposition noft-these parts, which leaves approximately one :half oftheupperiface ofthe body I free,-so. that :the-hingeewiththe axisofrotation 3 of the cover i-2iand the blade-spring l occupying the otherhalf, scan bezmade strong.

In the .modification accordingto Figs. v'7 to 12 the representedpocket.lighter comprisesia body I' preferably made of light metal bydie-casting. r-This body-isinserted in adrawn sleeve 26, preferably oflight metal plate, and tightly connected withthis sleeve by .a syntheticsubstance (syn- .thetic resin, varnish) resistant againstfuel. To thebody I a cover member 2, preferably also made of light'metal bydieecasting, is hinged by vmeans .of the axist. The covermeniberZ isinsertedinto.a.drawrrlid'21,.preferably also of light .metal plateandfixedto this latter by mean of a synthetic substance.

.The bladespring I mounted'between the body I .and the cover member 2for the convenient .opening and closing. of the cover is mounted in.analogousmanner, as the spring in the example according to Figs. 1' to.6.

The body I is formed with an extension 28 reaching. tothe bottom of thedrawn sle-evef'25. 'Thisextension serves two purposes. FirStLit isprovided with a recess 42 in which the driving roller-l6 is mounted byits axis'll, and second -.it,.is providedat the bottom of the sleevewith a .i'oot 54' having a threaded bore for receivin the fillingsc'rewI4.

In con-tra'distinctionto the example according .toFigsfl to 6, the flint2-3 is placed in'a channel made by an'appropriately cut out'and'bent.,piece.of sheet material. This channel 39 is-pr ,vided with a fiatextensionts having aq'bore'by Vmeansof which the channel is rotatablymounted .on the upper end of.the axis I! for the'drivin-g .rollerl6. Thefriction wheel I8 which is'screwed by means of a leit'hand thread on the"upper end of the axis. ll, rotatably maintains the channel'3!) on theaxis ll. .In proximity ofthe friction wheel the channel'38 is furtherprovided'with "two flaps3I, surrounding the'fiint 28 and preventingit'frorn falling out of thechannel.

The feed of the flint is effected by the pressure ilever'2l, having apin 33 onits free end'which penetrates into the .channel '35. Thepressure lever 2| firmly connected With'the axis-24, is ..rotatablymounted in the bearing sleeve35 of the pressure lever. .The coiledspring 23 exertingpressureon the axis 2 1, is clamped withlone end in aslitfii. at the lower end of theaxis 24 and penetrates with the otherend in the bearing sleeve 35 for the pressure lever. This con-:struction has the-great advantage that the presisure-leverli, the axis.12 3," thebearing sleeve 35v sand-the .coiledspringfit. canpbe'assembled all vtogether outside .ofthe body lzand then :pressed .intothe corresponding bore 53in the body I together with the bearing sleeve.35. For-moving the pressure. leverfiiagainst thelaction of .the.springJZS, the lever isprovidedatits upper side with a slot 3%, inwhich a coin can be in- ;serted. vWhen the lever is turned by means ofthe coin in clockwise direction inaFigll, the pin 33 moves out of the.channelitdfor the flint 29; then by means of a slight return rotationof the driving. roller, the. channel 38 can be swung outardly. and anewfiint can be inserted. .Swingwith the flint 2t "inwardly .pin :intothe channel is ing the :channel 39 l5 and einserting the;-:'u"1t'erselyv efiected in analogous manner.

.Tie cap 'i for sealing the wickis carried on. a .blade'spring 29, whichis secured between the cover memberiand the drawn sleeve?! of the cover.

:The .drawn sleeve 26 andlid-Zl can be made vparticularlythirnwhen theyare stifiened by giving aiprofileas represented in Figures 7, ll andii].This construction results in a;pocket 25alighter of particularly srnalivWeight andhaving .a comparatively largefuel reservoir.

. In the use of .the clighten. the portions around :the frictionwheelifiand the wick I2.are.par-

ticularly-exposed togetting dirty. It is recom- 30.. mendedtherefore-,to colour black the surface of body l and the interior ofthe:.cover Zandxthe lid -2? which is visible. whenacpening the cover;while -..the visible.-.s.urfacewhen-:the cover is closed can--beniaintained ata light shade (gold .or'silver ---shade) Aparticularly advantageous treatment .of'the surface, when: the sleeve:26 andthelid ill .are drawn. from light.rnetal, is the anodicoxidation. i'he body 5 and the cover, when they are made as.die-jcastxparts, generallycannot be ao'anodioally oxidize but :anodicoxidation also 1 of these. parts is possible when the layerof oxideisxgiven a black. colouring, because Withblack colouring the spotsandstreaks generally prez-sent: on. anodically oxidized surfaces. ofdie-cast parts are. not visible.

. Asyin the previeusexample, the cover 2 or.lid 2! slightly projectsbeyond the body i when itis in the closed position, and also"projects-beyond sthezibodyd when'itis in open .position,.thus per-:mitting operationofzthe'lighter by means of a .single hand.

In the modification according to Figs. 18120 16, ftnexbody-l ofthelighter ispreferably made of ..light metal. p'I'he cover 2 isfhingedon the-body =I .byineansof the axis 3. The Wick cap 4,.eneclosingtheireeend of the Wick when the cover .lztisclosed, vis'secured tothe coveribymeans :ofarblade spring 29.

;A;recess ie is provided in theupper faceof ithe body: 5 inwhichisdisposed thecurved blade .spring 7 'maintaining'the cover 2 in open andzin closed position. The recess til extends from "the 'side' ofthebody'i 1 receiving the aXisS of 'the'cover until; about the middle of theupper face 10f theflbodyysothat the front half 4! of the upperfface isready to'receive thedifierent members of the ignition device.

The body 8 is provided with a recess '42 in which is disposed the fingerroller i6 fordriving lthe frictionwheel byits axis H. The upper end v.ofthe axisl l':is ,providedwitha leftv hand thread wandprojectsafrom theupperface sI, so that the .friction-wheel It can be screwed thereon. The-fiint-2e isinserted; in .asleeve-t l which is out out meandrbent:of;sheet:.-=material. .The sleevea i i has an extension 45 with a bore45 engaged over the end 43 of the axis 24 and maintained between thefriction wheel l8 and the upper face GI of the body I, so that thesleeve 44 is rotatable about the centre of the axis H. The sleeve $4 isprovided with an opening n along one side thereof, through whichpenetrates the pressure lever 48 into the interior of the sleeve, inorder to bear against the end of the flint 20, to prevent this latterfrom falling out and press it against the friction wheel 18.

The pressure lever 48 is pressed into the head 49 of an axis 24rotatable in the bearing'sleeve 35. The axis 24 is surrounded by acoiled spring 23 disposed in a recess 59 in the body I. The lower end ofthe spring 23 penetrates into the slotted end 51 of the axis 24, whilethe upper end of the spring penetrates into the bearing sleeve 35pressed firmly into the recess 50. The spring is thus tending to turnthe axis 24 and the pressure lever 48 in that direction in which thepressure lever bears against the fiint 2|], in order to press the latteragainst the friction wheel 18'.

The head 49 of the axis 24 is provided on its upper side with a slot 52,which is approximatively directed at right angles to the pressure lever48. A coin can be inserted for example into this slot in order to pivotthe head with the pressure lever against the action of the spring 23, inclockwise direction in Fig. 14 out of the sleeve 44, when a new ignitionpin is to be introduced into the sleeve. After the pressure lever 43 hasbeen moved out of the sleeve 45, the sleeve can be turned about the axisl? in counter-clockwise di rection in Fig. 1% until the end of thesleeve projects slightly beyond the side face of the body I, so that thenew flint can be conveniently introduced.

The end 48' of the pressure lever 6% bearing against the flint 29 isupwardly bent transversely to the sleeve 44. In this manner it will beprevented that for example when the finger roller I6 is turned incounterclockwise direction, an unintentional pivoting movement of thesleeve 44 capable of turning about the axis I1, is effected because theturned up end 48' of the pressure lever cannot penetrate through thelateral opening 41 of the sleeve.

The sleeve 44 is preferably made of steel plate and the inner diameterof the sleeve is made so great, that the flint 28 is elasticallymaintained by the friction of the sleeve wall. When in this case thepressure lever H3 is turned out of the sleeve for the purpose ofintroducing a new flint, the old, soon used up flint piece remains inthe sleeve and does not fall out, and moreover this piece cannot turnwhen a new flint i introduced, so that the engagement of the end of theflint piece adapted to the curvature of the friction wheel l8, with thefriction wheel is conserved and the formation of ignition sparks is notprejudiced.

When the lighter body I and the cover 2 are made of light metal, theirouter surface can be anodically oxidized. Also the driving roller l6 andthe filling screw in the bottom of the body can be made of light metaland anodically oxidized in the same manner as the outer surface of thelighter.

I claim:

1. In a pyrophoric lighter, a prismatic lighter body of substantiallyrectangular transverse section, a cover hingedly connected to thelighter body along one short side of the rectangular upper face of thelighter body, said upper face being provided with a recess extendingfrom said short side to which the'cover is connected to substantiallythe median transverse axis of said upper face, a blade spring lodged insaid recess and extending substantially on the level of the axis of saidhinge connection, said blade spring having one end engaging said coverand the opposite end bearing against the lighter body, said spring beingsubjected to buckling stress and tending to hold the cover in fully openor fully closed position, a wick projecting from the surface portion ofsaid upper face of the lighter body situated between said recess and theshort side of the upper face opposite that where the cover is connected,a friction wheel mounted on said surface portion, a flint coacting withsaid friction wheel, a longitudinally slotted guide tube for said flintpivotally mounted on the axis of said friction wheel, the lighter bodybeing provided with a bore extending downwardly from said surfaceportion at a point laterally of said guide tube, a lever arm pivotallymounted in said bore and extending into the guide tube for the flintthrough said longitudinal slot thereof, and a torsional spring engagedin said bore for urging said lever arm to apply the flint against thefriction wheel.

2. A pyrophoric lighter as claimed in claim 1, wherein saidlongitudinally slotted guide tube for the flint is formed of a piece ofbent sheet material, provided with an apertured extension engaged on theaxis of said friction wheel between one face of the wheel and saidsurface portion on the upper face of the lighter body.

3. In a pyrophoric lighter, a prismatic lighter body of substantiallyrectangular transverse section, a cover hingedly connected to thelighter body along one short side of the rectangular upper face of saidbody, said upper face being provided with a recess extending from thehinge connection to substantially the median transverse axis of saidrectangular upper face, a blade spring lodged in said recess andextending substantially on the level of the axis of said hingeconnection, said blade spring having opposite ends abutting against anend wall of the recess and against said cover for holding the cover infully open or fully closed position, an igniting mechanism mounted onthe lighter body between said end wall of the recess and the short sideof the lighter body opposite to said hinge connection, said ignitingmechanism including a rotatable friction wheel having its axis extendingat right angles to said upper face of the lighter body, a flint coactingwith the friction wheel, a laterally open guide sleeve for the flint,said sleeve having an extension pivotally mounted on the axis of thefriction wheel and engaged between the friction wheel and said upperface of the lighter body, a plug rotatably engaged in a recess in saidupper face, a lever arm carried by said plug and extending into saidlaterally open guide sleeve, a coiled spring within said recess tendingto turn said plug for urging said lever arm to apply the flint againstthe friction wheel, plug having an upwardly open slot adapted to beengaged for turning the plug against the action of said coiled spring toremove said lever arm from the flint tube.

4. In a pyrophoric lighter, a prismatic lighter body of substantiallyrectangular transverse section, a cover hingedly connected to thelighter body along one short side of the rectangular upper face of saidbody, said upper face being provided with a recess extending from thehinge connection to substantially the median transverse axis of saidrectangular upper face, a blade spring lodged in said recess andextending substantially on the level of the axis of said hingeconnection, said blade spring having opposite ends abutting against anend wall of the recess and against said cover for holding the cover infully open or fully closed position, the upper face portion of said bodybetween said end wall of the recess and the short side of the lighterbody opposite to said hinge connection being flat and provided withthree parallel bores extending downwardly into the lighter body, afriction wheel, an axis therefor mounted in one of said bores, a Wickprojecting through a second one of said bores, a flint coacting withsaid friction wheel, a laterally open guide sleeve for said flint, saidguide sleeve having an extension pivotally engaged on the axis of thefriction Wheel between the friction wheel and said upper face of thelighter body and a spring urged lever rotatably mounted in the third oneof said parallel bores and having a free end extending into saidlaterally open guide sleeve to urge the flint against the frictionwheel.

WALTER DALLENBACH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,759,340 Aronson May 20, 19301,961,577 Aronson June 5, 1934 1,965,681 Woodling July 10, 19342,070,232 Lenfant Feb. 9, 1937 2,102,108 Bolle Dec. 14, 1937 2,211,500Gabritsch Aug, 13, 1940 2,258,086 Bolle Oct. 7, 1941 2,331,445 WestonOct. 12, 943 2,419,889 Florman Apr. 29, 1947 FOREIGN PATENTS NumberCountry Date 128,406 Austria May 25, 1932 142,231 Switzerland Sept. 15,930 601,847 France Dec. 11, 1925 632,694 France Oct. 10, 1927

